To put it in perspective, my motherboard was somewhere around $400 and $500 (and was one of the "cheap" ones), and the processor costed me around $1200. I think the cooler was about $100. The power supply I ended up getting was about $200, but you can probably get cheaper - I got a platinum rated power supply, and you don't necessarily need that.
I would suggest that even an 8 core Ryzen 7 would be worth looking at - you still get 16 threads, and you pay a lot less. But, if you think Threadripper might be for you, it takes away the need to wait. Threadripper 2 won't be out until the second half of the year.
Also, Threadripper can mine. That is NOT a reason to buy it - mine is currently mining what would be roughly $1.60 to $1.75 per day - I plan to hang onto what I'm earning though (I'm paid in Bitcoin), as if Bitcoin rebounds, what I'm getting paid could potentially even double in value. If Monero (what it mines) goes up in value, that will help too - at my peak, it was mining about $4 per day. BUT - you can't count on any of that.
Hmm, maybe I'll cheap out and go with a Ryzen 7 now and live with the slower speeds on some tasks or just put them on my current PC/laptop to do them.
And then wait for the next big leap in graphics in particular and match that with a Threadripper or some other absurdly expensive CPU.
And I'll take the money saved and preorder/buy the new Vive.